This document summarizes the key characteristics and developments of early civilizations. It discusses the rise of organized societies along major river valleys in regions like Egypt, Mesopotamia, the Indus Valley, and China that practiced agriculture, trade, government, art, and science. These river valley civilizations developed irrigation systems, specialized labor divisions, long distance trade networks, and some of the earliest cities housing thousands. They also invented early forms of writing to record economic transactions. Overall, the document outlines the defining features of civilization and how early human settlements evolved into more complex social structures along major river systems, establishing the foundations for later globalization.